DNA is a string of chemical letters and such strings that make up a person’s DNA occur repeatedly in the genome and constitute the DNA Profile. These are known as short tandem repeats (STRs) and the number of repeats differs between individuals and can be counted. Each STR is made up of two strands, one inherited from the mother and one from the father. The DNA profile also includes a test of a gene called amelogenin, which can be used to test whether the DNA sample comes from a male (with an X and Y chromosome) or a female (with two X chromosomes).

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